JPS6170340A - Hot air space heater - Google Patents

Abstract

PURPOSE:To reduce the number of parts of an electronic control circuit, to suppress the production cost to a low value and to gently make variable the temperature of a hot air flow by controlling the rotational speed of a blower for convection by means of a rotational speed control circuit for controlling the rotational speed of the blower for convection by the stepless variable operation of the blower for combustion. CONSTITUTION:The amplifying part 46A of a power supply circuit 46 of a blower for combustion continuously increase or decrease the outputs from a rotational speed control circuit 44 and a blower actuating circuit 45, and the voltage value is varied in a stepless manner. The power supply quantity of a blower 102 for combustion is continuously increased or decreased, and the blower 102 for combustion is continuously varied in a stepless manner. Further, similarly as the power supply circuit 46 of the blower for the convection, the amplification part 47A of a blower 303 for convection continuously increases or decreases the output voltages of circuits 44 and 45 to increase or decrease the resistance value of a varistor 47B and to continuously control the power supply quantity of a bridge 47C. Hence, the blower 303 for convection is continuously varied in a stepless manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a hot air heater that heats a room by exchanging heat generated by combustion with room air.

[Prior art] A combustion air circulation path that introduces outdoor air from outside, mixes it with fuel such as gas or kerosene, burns it, and releases the combustion gas outdoors again; and an indoor air circulation path for exchanging heat between the indoor air and the indoor air.
Conventionally, in a heating machine, the combustion inlet, which takes in and discharges air in the combustion air circulation path, is variable steplessly by an amplifier circuit in accordance with the oxygen supply state of the flame. The convection blower that performs suction and discharge switches the relay in response to the heat level of the flame, and the convection blower turns on and off.
It was adjusted by switching the resistance value of the energizing circuit to 111 into several levels.

[Problems to be Solved by the Invention] In the conventional technology shown above, the air flow rate of the convection blower is controlled in several stages using a plurality of relays. Problems include an increase in the probability of potential failure due to the increase in the number of parts, an increase in production costs due to the increase in the number of parts, and rapid changes in hot air temperature due to the stepwise control of the convection blower.

An object of the present invention is to control a convection blower by a rotation speed control circuit that controls the rotation speed of a combustion blower.
To provide a hot air heater capable of reducing the number of parts of an electronic control circuit and steplessly varying the rotational speed of one convection blower.

[Means for Solving the Problems] In order to solve the above problems, the hot air heater of the present invention includes a combustion blower that supplies combustion air to a burner, and a convection blower that blows out the heat of the burner as hot air. A hot air heater comprising a blower and an electronic control circuit having a rotation speed control circuit that controls the rotation speed of the combustion blower based on a change in the output of a combustion detection sensor facing the burner, wherein the convection blower is configured such that the rotation speed is controlled by the rotation speed control circuit.

[Actions and Effects of the Invention] The hot air heater of the present invention having the above-mentioned configuration has a combustion feeder ff.
Convection feed using a rotation speed control circuit that continuously varies the rotation speed of one machine! By controlling the rotation speed of allJ, the following effects are achieved.

b) Since the number of parts of the electronic control circuit can be reduced, the potential failure probability of the electronic control circuit can be reduced.

O) Since the number of parts of the electronic control circuit can be reduced, production costs can be kept low, and inexpensive hot air heaters can be provided on the market.

c) Since the rotational speed of the convection blower can be varied steplessly, the temperature of the hot air discharged from the hot air heater can be gently varied or maintained at a constant temperature.

[Example] Next, a hot air heater of the present invention will be described based on an example shown in the drawings.

Figures 1, 2, and 3 show FF type gas hot air that mixes outdoor air introduced from outside with gas and burns it, exchanges heat with the combustion gas with indoor air, and discharges the combustion gas outdoors again. A configuration diagram and an electronic circuit diagram of the device are shown.

The FF type gas warm air device has a combustion air circulation path 1 that burns air introduced from outside and discharges it outside again, a gas introduction path 2 that supplies gas into the combustion air circulation path 1, and a gas introduction path 2 that supplies gas into the combustion air circulation path 1. an indoor air circulation path 3 that exchanges air with the combustion gas in the combustion air circulation path 1 and discharges it again as warm air; the combustion air circulation path 1; the gas introduction path 2; and the indoor air circulation path 3.
and an electronic control circuit 4 for driving and controlling.

The combustion air circulation path 1 includes an outdoor air introduction path 101 that introduces air from outside the room, and a combustion air introduction path 101 that sucks outdoor air from the outdoor air introduction path 101 to flow the air and combustion gas in the combustion air circulation path 1. Blower 102 and combustion blower 1
a gas ejection nozzle 103 that ejects gas into the air sucked in by the air pump 02; a gas burner 104 made of a ceramic group that burns the gas mixture; It consists of a heat exchanger 105 that exchanges heat with indoor air, and an exhaust path 106 that guides the combustion gas after heat exchange with the heat exchanger 105 to the outside.

The gas introduction path 2 is provided upstream of the gas combustion supply pipe 201 that supplies gas to the gas ejection nozzle 103, and includes a main valve 202 that is opened and closed by energization and de-energization, and a main valve 202 that is provided downstream of the main valve 202. , main valve 2
Safety valve 20 opened and closed by energization control like 02
3, a constant flow valve 204 that is provided downstream of the safety valve 203 and adjusts the pressure of the flow rate of gas, and a proportional control valve that is provided downstream of the constant flow valve 204 and whose opening degree is variable depending on the amount of energization. 205, and a flow rate adjustment screw 206 that allows a fixed amount of gas to flow out from upstream of the proportional control valve 205 to the gas jet nozzle 103 regardless of whether the proportional control valve 205 is opened or closed.
a gas bypass 207 having a proportional control valve 205;
It consists of a gas-rich burner passage 209 which is a bypass through which a certain amount of gas flows out from the upstream side of the gas burner 104 to a small oxygen-deficient nozzle 208 provided on the lower surface of the gas burner 104.

The indoor air circulation path 3 includes an indoor air inlet 302 having an air filter 301 that introduces indoor air into the FF type gas warm air device, and an indoor air circulation path that sucks indoor air from the indoor air inlet 302. a convection blower 303 for flowing air in the combustion air circulation path 1; and a heat exchanger 10 in the combustion air circulation path 1.
5 and a hot air discharge port 304 that discharges high temperature air after heat exchange.

The electronic control circuit 4 includes a spark electrode 401 that ignites a flame in the gas burner 104, a flame rod 402 that detects the flame on the surface of the gas burner 104, a thermocouple 403 that controls the rotation speed of the combustion air Vs102, and a thermocouple 403 that controls the combustion air circulation path 1. Combustion blower 102, main valve 202 of the gas introduction path 2, safety valve 203, proportional control valve 20
5. Drive and control the convection air blower 9303 of the indoor air circulation path 3, etc.

The electronic control circuit 4 includes a power supply circuit 41 that converts the 100 volt alternating current distributed to general households into a constant voltage direct current, and an ignition rotation speed setting circuit 42 that sets the rotation speed of the combustion blower 102 at the time of ignition. and combustion blower 102
A thermocouple amplifier circuit 43 receives the output of the thermocouple 403 that controls the rotation speed of the engine, and receives the output of the ignition rotation speed setting circuit 42, and detects the oxygen supply state by the output of the thermocouple amplifier circuit 43. The rotation speed control circuit 44 that controls the rotation speed of the combustion blower 102 during combustion, and the combustion method J! II! 1102 and convection air blower I! 1303, a combustion blower I@machine energization circuit 46 that drives the combustion blower 102 based on the output of the ignition rotation speed setting circuit 42, and A convection blower energizing circuit 41 that drives the convection blower 303 by the output, and a combustion blower 1 from the blower drive circuit 45.
a combustion blower rotation detection circuit 48 that detects the rotation of 02;
A spark detection circuit 49 that detects the spark state of the spark electrode 401, and the combustion method FFI machine rotation detection circuit 48.
The combustion air is blown into the combustion air circulation path 1 for a certain period of time during startup.
After detecting that 1102 blows air and detecting a spark in the spark detection circuit 49, the main valve 20
2, a solenoid valve drive circuit 50 that energizes the gas combustion supply pipe 201 to open the gas combustion supply pipe 201; a flame detection circuit 51 that detects the ignition state by detecting a flame with the flame rod 402 installed above the gas burner 104; A timer circuit 5 starts when the circuit 51 detects a flame, de-energizes the convection air blower 1a 303 for a certain set period of time, and operates a proportional control circuit 53 described below for a certain period of time.
2, receiving the output of the timer circuit 52 increases the opening degree of the proportional control valve 205 for a certain period of time, and compares the reference value obtained by the temperature setting device with the output signal from the temperature sensing element that detects the room temperature. Then, the difference between the reference value obtained by the proportional control circuit 53 that controls the energization m of the proportional control valve 205 and the temperature setting device of the proportional control circuit 53 and the output signal of the temperature sensing element reaches a certain value or more. Sometimes safety valve 203
a temperature control determination circuit 54 that controls the energization circuit to stop combustion of gas; a flashback detection circuit 55 that detects flashback based on the output of the thermocouple amplifier circuit 43; Combustion blower 102, main valve 2
02, an abnormality circuit 56 that generates an output that causes the spark electrode 401 to be de-energized, and receives the respective outputs of the flame detection circuit 51, temperature control judgment circuit 54, and abnormality circuit 56,
02, a convection air blower 11303, a point for controlling energization of the spark electrode 401, etc., and an Okawa sequence circuit 51.

Next, a combustion blower energization circuit 46 and a convection fmm energization circuit 47 are controlled by the rotation speed control circuit 44.
An example of this will be described.

As described above, the rotation speed control circuit 44 receives the output from the ignition rotation speed setting circuit 42 and the thermocouple amplifier circuit 43 and is provided to variably determine the rotation speed of the combustion blower, and is a blower drive circuit having a frequency generator and the like. 45, it is output to a combustion blower energization circuit 46 and a convection blower FF1 energization circuit 47.

The combustion blower energizing circuit 46 includes a transistor T'1 and a resistor R1 that amplifies the output from the blower drive circuit 45.
a voltage value control section 46B consisting of a resistor R2 and a transistor Tr2 which receives the output of the amplification section 46A and changes the voltage value;
A diode bridge 46C whose flow rate can be changed by changing the voltage of 6B, a combustion blower 102, and a convection blower ff.
It consists of a filter part 460 consisting of capacitors C1, C2, C3 and coils Ll and L2 for absorbing noise generated by the engine 303 or blocking external noise, and 46E is a voltage value controller 468 and a diode bridge 4.
This varistor is placed between 6C and absorbs and removes noise, surge, etc.

Like the combustion blower energizing circuit 46, the convection blower energizing circuit 47 includes an amplifying section 4 that includes a transistor Tr3 and a resistor R3 that amplifies the output from the blower drive circuit 45.
7A, a voltage value control section 47B which receives the output of the amplification section 47A and is made up of a transistor Tr4 and a resistor R4, which vary the voltage value, and a diode bridge whose energization amount is varied according to the voltage change of the voltage value control section 47B. 47C, 470 is a varistor disposed between the voltage value control section 47B and the diode bridge 47C to absorb and remove noise and surges, and 47E is the above-mentioned timer circuit 5.
2 is a normally closed contact that stops the rotation of the convection blower 303 for a certain period of time during startup.

From the above, the combustion blower energization circuit 46 has the amplifier section 46A.
is the rotation speed control circuit 44 and the feed ff1ll drive circuit 45.
The output from the 1102 is continuously increased and decreased, the voltage value is varied steplessly, the resistance value of the varistor 46B is varied, and the amount of current flowing through the diode bridge 46C is varied, thereby continuously energizing the combustion air blower ll1102. The combustion feed 1''02 is continuously varied steplessly. Similar to the combustion blower energization circuit 46, the convection blower energization circuit 47 has an amplifier section 47A connected to the rotation speed control circuit 44 and the blower drive circuit 45.
The convection blower 303 is also continuously varied steplessly in order to continuously increase and decrease the output voltage of the varistor 47B to vary the resistance value of the varistor 47B, and to continuously control the flow Nm of the diode bridge 47C. Generally, the convection blower 303 is the combustion blower 1.
1102, a damper for variable air volume is provided in the indoor air circulation path 3 and the air volume is finely adjusted by adjusting the position of the damper, or the combustion blower energizing circuit 46 , convection blower energizing circuit 4
The amplification values of the amplification sections 46A and 4γA of No. 7 may be changed.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a gas combustion type warm air heating island to which the present invention is applied, FIG. 2 is a block diagram of an electronic control circuit, and FIG. 3 is a diagram of the combustion blower energization circuit shown in FIG. It is an electronic circuit diagram of the convection feed ff11 energizing circuit.

Claims (1)

[Scope of Claims] 1) A combustion blower that supplies combustion air to the burner, a convection blower that blows out the heat of the burner as warm air, and a combustion detection sensor that controls the combustion by changing the output of a combustion detection sensor facing the burner. and an electronic control circuit having a rotation speed control circuit for controlling the rotation speed of the convection blower, wherein the convection blower is provided so that its rotation speed is controlled by the rotation speed control circuit. A hot air heater characterized by: 2) The hot air heater according to claim 1, wherein the combustion detection sensor is a thermocouple that detects the heat of the flame of the burner to detect the oxygen supply state of the flame.